Schwarzkopf BC Bonacure pH 4.5 Color Freeze Treatment 6.7 Ounce 200 Milliliters This mask is designed for colored, discolored or excessively treated hair. This enriched and treating emulsion contains hydrolysed keratin to fill structural voids from the outer layer of the hair to the cortex. The pH 4.5 Balancer instantly tightens the internal hair structure and traps color pigments in the deeper layers of the matrix while improving the strength and elasticity of colored hair. In combination with Cell Perfector Technology, the capillary surface is sealed to perfection providing protection against external aggressions such as water or drying with a dryer. The hair receives its optimum pH 4.5 and is seen with a color as intense as the first day until the next visit to the salon.